The wheelbase on that looks great! I've seen way more frame swaps where the wheelbase isn't correct for the body than ones that look like they are supposed to.
As long as your welds are good you probably won't have a problem with the bracket as is. That being said a boxing in the top of the bracket would give it a more finished look and peace of mind for you.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold
1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold
1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears) under construction
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